preheat broiler to low. Remove stems, and gently scrape out the gill from the underside of the mushroom cap and discard. Rub olive oil onto mushrooms and place on a baking sheet. Broil until tender, about 4 to 5 minutes.
Meanwhile, cook beef with onion, pepper, and garlic in a large skillet until brown over medium-high heat. Reduce heat, add tomatoes and spices, and simmer for 10 minutes.
Divide the mixture into four portions, then scoop one portion into each mushroom cap (serve any excess filling alongside the mushroom). Sprinkle approximately 1oz. of cheese on top of each mushroom.
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